You had previously requested for "Devs iPad". I will do 2 more for you.
The beta texture that you saw comes from a 256x256 image. That's how website renders the texture on your browser. They tile the image. I got the texture from 's website itself. However as explained in the first post, viewing them on a retina display will render the texture smaller and denser together. Hence I had to recreate the iCloud background using PhotoShop, using layers filled with noise rendering and blurring effects to get the same aspect ratio as seen on a non-retina display. However, it is not so easily with the beta background, because the beta uses a fabric (t-shirt) texture. It is very consuming if not highly impossible to get the same effect using Photoshop from sketch. Therefore I had to use the original texture instead. It is a trade off. Perhaps when I have too much time on my hand I will correct this, or if there is any member who has similar high-res fabric texture for me, I will be willing to give it a go.